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| author | Feng Xue <fxue@os.amperecomputing.com> | 2018-08-09 04:38:03 -0400 |
|---|---|---|
| committer | Feng Xue <fxue@os.amperecomputing.com> | 2019-02-01 08:14:21 -0500 |
| commit | 83d1cc42d8e6b18a4b6ba53addfdae98c694ea36 (patch) | |
| tree | 31baf4b5309964aadf357cb81b21f5e6614a983e /sysdeps/aarch64/multiarch/memchr.c | |
| parent | c7d3890ff51bceb38fac0947ce1f2bb0c34f6b15 (diff) | |
| download | glibc-83d1cc42d8e6b18a4b6ba53addfdae98c694ea36.tar.gz glibc-83d1cc42d8e6b18a4b6ba53addfdae98c694ea36.tar.xz glibc-83d1cc42d8e6b18a4b6ba53addfdae98c694ea36.zip | |
aarch64: Optimized memchr specific to AmpereComputing emag
This version uses general register based memory instruction to load
data, because vector register based is slightly slower in emag.
Character-matching is performed on 16-byte (both size and alignment)
memory block in parallel each iteration.
* sysdeps/aarch64/memchr.S (__memchr): Rename to MEMCHR.
[!MEMCHR](MEMCHR): Set to __memchr.
* sysdeps/aarch64/multiarch/Makefile (sysdep_routines):
Add memchr_generic and memchr_nosimd.
* sysdeps/aarch64/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add memchr ifuncs.
* sysdeps/aarch64/multiarch/memchr.c: New file.
* sysdeps/aarch64/multiarch/memchr_generic.S: Likewise.
* sysdeps/aarch64/multiarch/memchr_nosimd.S: Likewise.
Diffstat (limited to 'sysdeps/aarch64/multiarch/memchr.c')
| -rw-r--r-- | sysdeps/aarch64/multiarch/memchr.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/sysdeps/aarch64/multiarch/memchr.c b/sysdeps/aarch64/multiarch/memchr.c new file mode 100644 index 0000000000..3a2f1d1c73 --- /dev/null +++ b/sysdeps/aarch64/multiarch/memchr.c @@ -0,0 +1,41 @@ +/* Multiple versions of memchr. AARCH64 version. + Copyright (C) 2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* Define multiple versions only for the definition in libc. */ + +#if IS_IN (libc) +/* Redefine memchr so that the compiler won't complain about the type + mismatch with the IFUNC selector in strong_alias, below. */ +# undef memchr +# define memchr __redirect_memchr +# include <string.h> +# include <init-arch.h> + +extern __typeof (__redirect_memchr) __memchr; + +extern __typeof (__redirect_memchr) __memchr_generic attribute_hidden; +extern __typeof (__redirect_memchr) __memchr_nosimd attribute_hidden; + +libc_ifunc (__memchr, + ((IS_EMAG (midr) + ? __memchr_nosimd + : __memchr_generic))); + +# undef memchr +strong_alias (__memchr, memchr); +#endif |